SkyDemon is really a good flight planning tool and it would make the application even better if one was able to save the flight plan in FSX/Prepar3D-format
Regards
Kennet

How would that make it better? Can you describe the situation where a pilot would wish to import data in those formats so we can understand the requirement?
I'm guessing FSX is the simulator but I have no idea what the other tool you mentioned is.